Bug#878162: systemd-networkd ignores MTU from RA

[Michael Biebl]

Control: fixed -1 233-1

On Tue, 10 Oct 2017 17:53:44 +0200 Cyril Brulebois <cyril at debamax.com>
wrote:
> Package: systemd
> Version: 232-25+deb9u1
> Severity: important
> Tags: patch ipv6
> 
> Hi,
> 
> A customer of mine reported a regression by switching from jessie to
> stretch: /etc/systemd/network/eth.network is configured to only set up
> IPv4, and systemd in jessie used to do only that, and not to touch IPv6
> at all:
> | [Match]
> | Name=eth0
> | [Network]
> | Address=192.168.42.202/24
> | Gateway=192.168.42.1
> | DNS=192.168.42.200
> 
> Anyway: accept_ra_mtu defaults to true, is set to true on the target
> system, but systemd doesn't honour MTU settings, and defaults to the
> interface's MTU for the IPv6 routes it sets up.
> 
> This is fixed upstream between 232 and 233:
> | commit d6fceaf1f7ff765bdc3b135f3d3676ec689da312
> | Author: Susant Sahani <ssahani at users.noreply.github.com>
> | Date:   Thu Nov 24 03:02:19 2016 +0530
> | 
> |     networkd: handle MTU field in IPv6 RA (#4719)
> |     
> |     This patch handles the custom MTU field in IPv6 RA.
> |     
> |     fixes RFE #4464
> 
> I haven't checked that the Debian packages in buster/unstable indeed
> avoid running into this issue, but I've confirmed that cherry-picking
> this patch on top of the stretch package fixes this issue. I'm attaching
> the source debdiff which was successfully tested.

Let's assume v233 does fix the issue then. Marking the bug accordingly.

> Thanks for considering a fix through stretch-proposed-updates.

I've usertagged it for now so it shows up at [1].

Michael

[1]
https://bugs.debian.org/cgi-bin/pkgreport.cgi?users=pkg-systemd-maintainers@lists.alioth.debian.org;dist=stable;tag=stretch-backport
-- 
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